Gas in the protoplanetary disc of HD 169142: Herschel's view
Artikel i vetenskaplig tidskrift, 2010

In an effort to simultaneously study the gas and dust components of the disc surrounding the young Herbig Ae star HD 169142, we present far-IR observations obtained with the PACS instrument onboard the Herschel Space Observatory. This work is part of the open time key program GASPS, which is aimed at studying the evolution of protoplanetary discs. To constrain the gas properties in the outer disc, we observed the star at several key gas-lines, including [OI] 63.2 and 145.5 mu m, [CII] 157.7 mu m, CO 72.8 and 90.2 mu m, and o-H2O 78.7 and 179.5 mu m. We only detect the [OI] 63.2 mu m line in our spectra, and derive upper limits for the other lines. We complement our data set with PACS photometry and (CO)-C-12/13 data obtained with the Submillimeter Array. Furthermore, we derive accurate stellar parameters from optical spectra and UV to mm photometry. We model the dust continuum with the 3D radiative transfer code MCFOST and use this model as an input to analyse the gas lines with the thermo-chemical code ProDIMo. Our dataset is consistent with a simple model in which the gas and dust are well-mixed in a disc with a continuous structure between 20 and 200 AU, but this is not a unique solution. Our modelling effort allows us to constrain the gas-to-dust mass ratio as well as the relative abundance of the PAHs in the disc by simultaneously fitting the lines of several species that originate in different regions. Our results are inconsistent with a gas-poor disc with a large UV excess; a gas mass of 5.0 +/- 2.0 x 10(-3) M-circle dot is still present in this disc, in agreement with earlier CO observations.

planetary systems

dust

circumstellar matter

grains

infrared: planetary systems

hd-169142

radiative-transfer

emission

scattering

protoplanetary disks

stars: pre-main sequence

systems

continuum

stars

spectra

Författare

G. Meeus

Universidad Autonoma de Madrid (UAM)

C. Pinte

University of Exeter

Université Grenoble Alpes

P. Woitke

University of Edinburgh

Royal Observatory

B. Montesinos

Centro de Astrobiologia (CAB)

I. Mendigutia

Centro de Astrobiologia (CAB)

P. Riviere-Marichalar

Centro de Astrobiologia (CAB)

C. Eiroa

Universidad Autonoma de Madrid (UAM)

G. S. Mathews

University of Hawaii at Manoa

B. Vandenbussche

KU Leuven

C. D. Howard

NASA Ames Research Center

A. Roberge

NASA Goddard Space Flight Center

G. Sandell

NASA Ames Research Center

G. Duchene

Université Grenoble Alpes

University of California

F. Menard

Université Grenoble Alpes

C. A. Grady

NASA Goddard Space Flight Center

Eureka Scientific, Inc.

W. R. F. Dent

European Southern Observatory Santiago

Atacama Large Millimeter-submillimeter Array (ALMA)

I. Kamp

Rijksuniversiteit Groningen

J. C. Augereau

Université Grenoble Alpes

W. F. Thi

University of Edinburgh

Université Grenoble Alpes

I. Tilling

University of Edinburgh

J. M. Alacid

Centro de Astrobiologia (CAB)

S. Andrews

Harvard-Smithsonian Center for Astrophysics

D. R. Ardila

CalTech

G. Aresu

Rijksuniversiteit Groningen

D. Barrado

Centro de Astrobiologia (CAB)

Calar Alto Astronomical Observatory

S. Brittain

Clemson University

D. R. Ciardi

National Aeronautics and Space Administration

W. Danchi

NASA Goddard Space Flight Center

D. Fedele

Universidad Autonoma de Madrid (UAM)

Johns Hopkins University

Max Planck-institutet

I. de Gregorio-Monsalvo

Atacama Large Millimeter-submillimeter Array (ALMA)

European Southern Observatory Santiago

A. Heras

ESTEC

N. Huelamo

Centro de Astrobiologia (CAB)

A. Krivov

Friedrich-Schiller-Universität Jena

J. Lebreton

Université Grenoble Alpes

René Liseau

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

C. Martin-Zaidi

Université Grenoble Alpes

A. Mora

European Space Astronomy Centre (ESA)

M. Morales-Calderon

Spitzer Science Center

H. Nomura

Kyoto University

E. Pantin

Astrophysique, Instrumentation et Modelisation de Paris-Saclay

I. Pascucci

Johns Hopkins University

N. Phillips

University of Edinburgh

L. Podio

Rijksuniversiteit Groningen

D. R. Poelman

University of Edinburgh

S. Ramsay

European Southern Observatory (ESO)

B. Riaz

Johns Hopkins University

K. Rice

University of Edinburgh

E. Solano

Centro de Astrobiologia (CAB)

H. Walker

Rutherford Appleton Laboratory

G. J. White

Rutherford Appleton Laboratory

Open University

J. P. Williams

University of Hawaii at Manoa

G. Wright

Royal Observatory

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 518 Article Number: L124 L124

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201014557